180 The Ohio Journal of Science [Vol. XX, No. 6, 



Gastrocopta contracta Say, common, variable as to size and 

 shape; mostly rather stout and ventricose, peristome 

 markedly continuous in most, and well everted; in some, 

 the aperture is more than usually obstructed, especially the 

 parieto-angular and the columellar lamellae being large, 

 while in some others the columellar is exceptionally small. 



Gastrocopta pentodon Say, scarce; one specimen is much like 

 the form gracilis. 



Gastrocopta tappaniana Adams, abundant; few specimens are 

 typical, i. e., of the usual size and subcylindrical shape; 

 most are small, 1.4 to 1.7 mm. long, and oval (form curta), 

 generally with the lamellae and plicag well formed, though 

 the infraparietal is missing in most; some are more conical, 

 with the last whorl exceptionally large and well rounded. 



One specimen, supposedly of a Gastrocopta, is of a very 

 peculiar shape: long. 3, diam. 1.5 mm.; cylindrical, perforate, 

 whorls 6/3, the last not much larger, well rounded, without any 

 crest or impression over the palate; a very small, vestigial 

 parietal lamella, a somewhat stronger columellar; in the palate 

 there is a slight irregular callus with apparently a vestigial 

 lower palatal plica; shell chalky, had apparently been colorless. 

 In the absence of more evidence it cannot be regarded as a dis- 

 tinct species, but may be a monstrous, overgrown specimen of 

 G. tappaniana. Similar forms of recent G. armifera have been 

 seen. 



Gastrocopta corticaria Say, very scarce. 



Vertigo ovata Say, somewhat scarce; some specimens are small, 

 with the lamellas and plicae strongly developed; one is 

 larger than the average*, 2.3 mm. long, with the upper 

 palatal plica exceptionally large and strongly directed 

 upward. 



Vertigo morsel Sterki, very common; many are rather small 

 (length 2.3 to 3 mm.), and more ovoid-turriculate than 

 cylindrical, but in these also the last whorl is compar- 

 atively small; the presence of an infraparietal is rather 

 exceptional : of one hundred specimens it was found only in 

 ten, a small nodule or vestigial. Some specimens are quite 

 short, oval, with the last whorl somewhat flattened below 



*W. G. Binney, in Mon. Am. Land Shells, p. 334, gives the length of V. ovata 

 as 3 mm. This is evidently a mistake, or error. 



